JPH0219936Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a coil bobbin for a flyback transformer used in a television receiver.

(B) Prior art A plurality of low voltage terminals of a flyback transformer are arranged in a circular ring as described in, for example, Japanese Utility Model Application Publication No. 52-137024. Usually, these low voltage terminals are attached to a terminal mounting part integrally molded on the coil bobbin. is fixed. The terminal attachment portion extends radially from the outer periphery of the coil bobbin with the center of the cylindrical portion around which the coil is wound. Furthermore, at least one protrusion is provided on the cylindrical side end of the terminal attachment part, and the winding wire is hooked onto this protrusion and wound around the cylindrical part.

Here, the coil bobbin is provided with a core insertion guide connected to the cylindrical portion, and the terminal attachment portion on the side closer to the core insertion guide among the terminal attachment portions is connected to the cylindrical portion as shown in FIG. It protrudes from the side wall of the core insertion guide without protruding from the core insertion guide.

On the other hand, the coil is usually wound in such a way that the tertiary coil is wound in the middle on the axis of the cylindrical portion, and then the primary coil is wound over the entire cylindrical portion.

Therefore, when the tertiary coil 1 is pulled out from the terminal of the terminal mounting part near the core insertion guide as shown in FIG. 3 It will be in a state where it is slightly floating from the circumferential surface. Therefore, the primary coil 4 wound later will not be a perfect circle, which will cause deterioration of characteristics.

In addition, due to the tension of the primary coil, the above-mentioned 3
There is a risk of damage to the contact area between the winding start of the secondary coil and the primary coil, resulting in a shot.

In addition, in FIG. 1, 5 is a terminal attachment part, 6 is a protrusion, and 7 is a terminal.

(c) Purpose of the invention This invention was created in view of the above points,
To provide a highly reliable coil bobbin for a flyback transformer, in which the winding start of the coil is tightly wound on the surface of a cylindrical part even when the tertiary coil is led out from a terminal close to a core insertion guide. It is.

(d) Structure of the invention The present invention includes a hollow cylindrical part, a core insertion guide continuous to the hollow cylindrical part, a plurality of terminal mounting parts extending from the outer periphery of the hollow cylindrical part, and at least one terminal mounting part in each terminal mounting part. In the coil bobbin of a flyback transformer integrally formed with a protrusion provided on the coil bobbin for locking the winding, among the plurality of terminal attachment portions,
A coil bobbin for a flyback transformer, in which a terminal mounting part close to the core insertion guide is arranged such that its extension line passes through the opposite side of the core insertion guide with respect to the center point of the hollow cylindrical part. .

(e) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a plan view of a coil bobbin in one embodiment of the present invention.

In the figure, 10 is a coil bobbin, and a cylindrical portion 11 around which a coil is wound and a core insertion guide 12 are integrally molded. Furthermore, first to tenth terminal attachment parts 13a to 13j, each having terminals 7, 7, . . . at their tips, protrude outward from the cylindrical part. Note 14,
14... are protrusions projecting from the side walls of each terminal mounting portion. The terminal mounting portions described above are arranged symmetrically, and the points where the extension lines of the pair of left and right symmetrical terminal mounting portions intersect are at least above the center point O of the cylindrical portion 11 in the figure, i.e. It is located on the opposite side to the core insertion guide 12 side.

Therefore, at least the extension lines of the first and tenth terminal attachment portions 13a and 13j pass through the center point O on the side opposite to the core insertion guide 12 side.

Therefore, at least the side portions of the first and tenth terminal attachment portions on which the protrusions 14, 14 are arranged extend from the outside of the cylindrical portion 11 rather than from the side wall of the core insertion guide 12.

FIG. 3 shows another embodiment of the present invention, in which the first to tenth terminal mounting portions 21a arranged on the coil bobbin 20 are shown.
21j has an arcuate shape such that the radius of curvature decreases as it approaches the core insertion guide 22.

At least the extension lines of the first and tenth terminal mounting portions 21a and 21j are relative to the center point O.
In order to pass through the side opposite to the core insertion guide 22 side, at least the side edges of the first and tenth terminal mounting portions on which the protrusions 24, 24 are arranged extend from the outside of the cylindrical portion 23.

(f) Effects of the invention As described above, according to the invention, even if the tertiary coil is pulled out from the terminal of the terminal mounting part near the core insertion guide, the first winding of this tertiary coil will not pass through the core insertion guide. Since the coil directly contacts the cylindrical portion without contacting the side wall of the coil, the primary coil that is wound later becomes close to a perfect circle and does not cause characteristic deterioration.

Further, the contact portion between the primary coil and the tertiary coil is not damaged, and the effect is great.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the relationship between the primary coil and the tertiary coil in a conventional coil bobbin, Fig. 2 is a plan view of the coil bobbin in one embodiment of the present invention, and Fig. 3 is a diagram showing the relationship between the primary coil and the tertiary coil in a conventional coil bobbin. It is a top view of a coil bobbin. Explanation of main drawing numbers, 10 , 20 ... Coil bobbin, 11, 23... Cylindrical part, 12, 22... Core insertion guide, 13a-13j, 21a-21j...
...Terminal mounting part, 14, 24...Protrusion, 7...Terminal.

Claims (1)

[Scope of utility model registration request] A hollow cylindrical portion, a core insertion guide connected to the hollow cylindrical portion, a plurality of terminal attachment portions extending from the outer periphery of the hollow cylindrical portion, and at least one terminal attachment portion provided in each of the terminal attachment portions to lock the winding. In the coil bobbin of a flyback transformer integrally molded with a protrusion, of the plurality of terminal mounting parts, the terminal mounting part that is close to the core insertion guide is arranged so that its extension line is relative to the center point of the hollow cylindrical part. A coil bobbin of a flyback transformer arranged to pass through the opposite side of the core insertion guide.